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Solubility-normalized combined adsorption-partitioning sorption isotherms for organic pollutants

Kleineidam, Sybille ; Schüth, Christoph ; Grathwohl, Peter (2002)
Solubility-normalized combined adsorption-partitioning sorption isotherms for organic pollutants.
In: Environmental Science and Technology, 36 (21)
doi: 10.1021/es010293b
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Equilibrium sorption isotherms were measured for five different low-polarity organic compounds (benzene, trichloroethene, 1,2- and 1,4-dichlorobenzene, and phenanthrene) over a wide concentration range. The investigated sorbents can be grouped into the following three classes: (1) humic soil organic matter, which shows linear sorption isotherms (solely partitioning, as observed in the peat sample); (2) carbon materials, which were thermally altered (due to their natural history or industrial production) and thus contain a high specific surface area and exhibit nonlinear isotherms, and (3) pure engineered microporous materials (e.g., zeolites and activated carbon), where adsorption is solely due to a pore-filling process. Sorption of all compounds was fitted very well by the Polanyi-Dubinin-Manes (PDM) model, which for sorbents containing humic organic matter (e.g., peat) was combined with linear partitioning. Both the partitioning and the Polanyi-Dubinin-Manes model predict unique sorption isotherms of similar compounds if the solubility-normalized aqueous concentration is used. In addition, an inverse linear relationship between the distribution coefficient (Kd) and water solubility, which was very well confirmed by the data, is obtained. This also leads to unit-equivalent Freundlich sorption isotherms and explains the often observed apparent correlation between sorption capacity at a given concentration (e.g., Freundlich coefficient) and sorption nonlinearity (Freundlich exponent).

Typ des Eintrags: Artikel
Erschienen: 2002
Autor(en): Kleineidam, Sybille ; Schüth, Christoph ; Grathwohl, Peter
Art des Eintrags: Bibliographie
Titel: Solubility-normalized combined adsorption-partitioning sorption isotherms for organic pollutants
Sprache: Englisch
Publikationsjahr: 2002
Verlag: American Chemical Society
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Environmental Science and Technology
Jahrgang/Volume einer Zeitschrift: 36
(Heft-)Nummer: 21
DOI: 10.1021/es010293b
URL / URN: https://pubs.acs.org/doi/abs/10.1021/es010293b
Kurzbeschreibung (Abstract):

Equilibrium sorption isotherms were measured for five different low-polarity organic compounds (benzene, trichloroethene, 1,2- and 1,4-dichlorobenzene, and phenanthrene) over a wide concentration range. The investigated sorbents can be grouped into the following three classes: (1) humic soil organic matter, which shows linear sorption isotherms (solely partitioning, as observed in the peat sample); (2) carbon materials, which were thermally altered (due to their natural history or industrial production) and thus contain a high specific surface area and exhibit nonlinear isotherms, and (3) pure engineered microporous materials (e.g., zeolites and activated carbon), where adsorption is solely due to a pore-filling process. Sorption of all compounds was fitted very well by the Polanyi-Dubinin-Manes (PDM) model, which for sorbents containing humic organic matter (e.g., peat) was combined with linear partitioning. Both the partitioning and the Polanyi-Dubinin-Manes model predict unique sorption isotherms of similar compounds if the solubility-normalized aqueous concentration is used. In addition, an inverse linear relationship between the distribution coefficient (Kd) and water solubility, which was very well confirmed by the data, is obtained. This also leads to unit-equivalent Freundlich sorption isotherms and explains the often observed apparent correlation between sorption capacity at a given concentration (e.g., Freundlich coefficient) and sorption nonlinearity (Freundlich exponent).

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Hydrogeologie
Hinterlegungsdatum: 17 Apr 2018 12:09
Letzte Änderung: 12 Jan 2019 21:20
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